The phrase "arterial time" is not a standard expression in written English and may not be widely recognized.
It could potentially be used in a specific context related to medical or physiological discussions, particularly concerning blood flow or circulation.
Example: "The study focused on the effects of exercise on arterial time and its impact on cardiovascular health."
Alternatives: "blood flow time" or "circulatory time".
The IAUC-A was calculated by first subtracting the average pre-contrast signal intensities in the artery from the arterial time series, then using the trapezium rule to calculate the total area under the resulting change in enhancement out to times of 60 and 180 s (IAUC-A 60) IAUC-A 60and80)) after contrast injection.
Most of the samples were taken in the first 3 min to ensure adequate description of the arterial time activity curve.
Multidetector CT-scan were first carried out without contrast and secondarily contrast-enhanced with early (arterial time 30 s) and delayed (portal venous time 60 70 s) acquisitions following intravenous contrast medium infusion.
The major temporal limitation of this arterial acquisition window originates from venous enhancement because of gadolinium that returns from the cranial circulation: the pure arterial time window lasted on average only 8 s in the study group, which is quite short.
Therefore, the arterial time-to-peak (Tart-peak) was used for bolus timing.
Simultaneously with data acquisition, the arterial time-activity curve is visualized on the computer screen as well as saved to a csv file.
For this comparison, the arterial time-activity curves were normalised to their mean radioactivity concentrations during the last 4 min of the scan to account for possible small differences in amount of injected 15O-water.
These included the arterial time-to-peak (Tart-peak) and other arterial, venous and mixed arteriovenous circulation times.
An arterial time-density curve (TDC) for the entire acquisition time of each study was generated automatically.
Calculation of these parameters is strictly dependent on the arterial time-density curves (TDCs) obtained by positioning a region of interest (ROI) on the input function vessel [ 5].
In the test bolus series the arterial time-to-peak showed a large 95% confidence interval of 12 27 s, indicating the need for individual MRA timing.
